- Marshall-Smith syndrome [DOID:0050858]
A syndrome that is characterized by advanced bone age, failure to thrive, respiratory problems, dysmorphic facial features, and variable mental retardation.
- Smith-Magenis syndrome [DOID:0060768]
A chromosomal deletion syndrome that is characterized by mild-to-moderate infantile hypotonia, minor skeletal anomalies, prepubertal short stature, brachydactyly, ophthalmologic and otolaryngologic abnormalities, peripheral neuropathy, developmental delay, cognitive impairment, and behavioral abnormalities that has_material_basis_in a 3.7-Mb interstitial deletion in chromosome 17p11.2 or sometimes by mutations in the RAI1 gene in the same region.
- Smith-McCort dysplasia 1 [DOID:0081270]
A Smith-McCort dysplasia that is characterized by short limbs and a short trunk with a barrel-shaped chest and has_material_basis_in homozygous or compound heterozygous mutation in the DYM gene (607461) on chromosome 18q21.
- Smith-McCort dysplasia 2 [DOID:0081271]
A Smith-McCort dysplasia that is characterized by short trunk dwarfism with a barrel-shaped chest, rhizomelic limb shortening and that has_material_basis_in homozygous or compound heterozygous mutation in the RAB33B gene on chromosome 4q31.
- Bannayan-Riley-Ruvalcaba syndrome [DOID:0050657]
A Cowden syndrome that is characterized by macrocephaly, multiple noncancerous tumors and hamartomas, and dark freckles on the penis, and has_material_basis_in heterozygous germline mutation in the PTEN gene on chromosome 10q23.
- autoimmune lymphoproliferative syndrome [DOID:6688]
A hypersensitivity reaction type IV disease that is an inherited disorder in which the body cannot properly regulate the number of immune system cells (lymphocytes). It is characterized by the production of an abnormally large number of lymphocytes. Accumulation of excess lymphocytes results in enlargement of the lymph nodes, the liver, and the spleen.
- X-linked mental retardation-hypotonic facies syndrome-1 [DOID:0080982]
A syndromic X-linked intellectual disability that is characterized primarily by severe mental retardation, dysmorphic facies, and a highly skewed X-inactivation pattern in carrier women and that has_material_basis_in mutation in the ATRX gene. X-linked mental retardation-hypotonic facies syndrome comprises several syndromes previously reported separately. These include Carpenter-Waziri, Holmes-Gang, and Smith-Fineman-Myers syndromes. X-linked alpha-thalassemia/mental retardation syndrome is an allelic disorder with a similar phenotype with the addition of alpha-thalassemia and Hb H inclusion bodies in erythrocytes.